Retro Arms CNC Hop Chamber AR15 PRO

Currently out of stock across all retailers.

Prices last checked July 30, 2026 across 2 retailers.

Introducing the Retro Hop Chamber in final form, the Pinnacle of Retro Arm's Hop up chamber line for AR Style Airsoft Replicas. Retro has their Basic, Pro, and now the Ultra. Each hop chamber has an increase in modularity and tun-ability. The ultra is for those craving perfection with completely modularity. The Retro Arm CNC Hop Chamber Ultra has an adjustable feeding shaft as well as an adjustable Nozzle shaft. This is a key feature when fine tuning your replica, if your nozzle is sitting just a hair too far into the chamber, you can add a shim to the nozzle shaft. (Shims Included) Notes from Retro The ultimate solution for players, who want a fully customizable Hop Up chamber. Hop Up chamber ULTRA is also based on our chamber BASIC and is also made on precise CNC machines from aviation grade aluminium 7075. This chamber also has the adjustable feeding shaft as the chamber PRO . New features include adjustable nozzle shaft, which is meant to be used to make the chamber sit more forward , when necessary. This feature is really helpful for tuning the longitudinal position of the chamber and thus e.g. adjusting the reliability of feeding , or position relative to the magazine . The position can be adjusted by 0.2 mm increments with included shims . Bear in mind that this feature also requires use of different length nozzles . The adjustable nozzle shaft will be offered with multiple outer diameters for you to choose the best option according to your GB shell. The next ULTRA feature is the inner barrel securing mechanism . Compared to the standard solution, we completely redesigned this mechanism, to mitigate the main fault - the C-clip cannot hold the barrel in place (longitudinal movement and rotation). This new system consists of a reshaped C-clip made of POM, and a custom union nut , which holds the C-clip tightly to the barrel and is also precisely machined to be able to reliably center the inner barrel. With this solution, the C-clip cannot twist loose with barre

Retro Arms CNC Hop Chamber AR15 PRO price comparison: the lowest price is $55.00 at The Real Deal Airsoft, the highest is $100.00, and the median across 3 tracked listings is $85.00. Comparing retailers can save up to 45% ($45.00) versus the highest-priced listing.

Compatible with: M4/AR

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